•Compression system puts Wikipedia on the phone
Australian IT, Australia
A PORTABLE version of popular online collaborative web encyclopedia Wikipedia will soon be available for the iPhone. Australia's leading technology incubator, Nicta, is planning to launch the reference tool as an application on Apple's iTunes App Store ...

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I did an XML dump of Wikademia the other day. It was about 145mbs (~6000 pages & ~700 articles).

I compressed it using 7Zip into ~3.5Mb.

The compression scheme is probably a bit different, but perhaps the principles still apply.